There are some in use. The key is not to overload them. Once you have it set how you like, make a backup just in case you need to reflash.
I don't recall seeing a time limit on the p/x offer. Call them and see what they say. Weigh up the offer with other manufacturer's new products and the price you would get for the 800 on ebay less fees. If he offers you a Nano, don't forget the HDD adpter is an added extra.